401K doesn’t kick in until 3 months from today, hold off and invest in taxable instead?

Title, I have already maxed out my ROTH IRA for the year, no debts, have an emergency fund. My employer 401k doesn’t kick in until I have been with the company for a year, I will be there for a year in June. Should I hold off on investing in my taxable brokerage account for these 3 months so that I can have more money to max out my 401k quicker 3 months from now?